Explanation
Red and blue are the two primary colours that are mixed to make purple. This is because when these two colours are combined, they create a shade that is perceived by the human eye as purple, due to the way that light waves of different wavelengths are absorbed and reflected. The QuizMaster of AnsweringExams.Com suggests remembering this by associating the date 27, which corresponds to the 27 degrees of refraction that blue light undergoes when passing through a prism, and recalling that red light refracts at a different angle, resulting in the mixture of the two producing purple. The incorrect options can be eliminated by considering the basic principles of colour theory and the properties of light. The competitive exams that test this topic include PPSC, FPSC, CSS, NTS, MDCAT and ECAT. Practice more at AnsweringExams.Com.
